product news/產ռ新聞


Foseco’s new line of filters aims to improve performance by mini- mizing inclusions and controlling metal flow.


ङऩ，֘滤过ङ新֝集ॠבक़ 控并ص最ӱصӗૅ杂ر过通是 。ਈ性高提来流液ً金Ӳ


Te filters perform two major functions that generate a


wide number of benefits for the casting producer: 1. Filtration: Filters can remove the majority of non-


metallic inclusions in the metal stream. Smaller particles are then trapped by a variety of chemical and physical mecha- nisms within the filter structure. Various investigations show filters are in the region of 80% efficient at removing inclu-


sions. 2. Flow Control: Filters reduce the energy within the


metal stream and facilitate low turbulence as the casting cavity fills.


Te benefits of filtration of steel castings include higher


integrity, less scrap, reduced rectification time and costs, improved surface finish and reduced inspection requirement. According to Modern Casting’s “48th Census of World


Casting Production,” the global production of steel castings is 11 million tons. Market surveys estimate that less than 8% of global steel casting tonnage is filtered, meaning roughly 10 million tons of castings are not being filtered. Foseco, the foundry division of Vesuvius, London, under-


took a market study to understand why the uptake of steel filtration technology has not reached a higher level. Many reasons can be cited, including casting size (some castings are currently too big to filter), casting type (some castings can be very low integrity) and geography (low labor costs making high levels of repair cost effective). Many steel casting facilities do use filtration technology


but only apply the filters to a limited proportion of the cast- ings they produce. Te reason for this includes concern that the application of the filter will cause problems and incon- sistencies during the casting process, particularly in terms of mold fill. It was also noted that there is a clear demand from casting producers for higher efficiency filters. In response to the need for filtration systems that provided


more consistent performance, Foseco developed an improved zirconia-based ceramic foam filter to complement its STE- LEX product range. STELEX ZR ULTRA incorporates a ceramic frame around the sides of the filter. Tis allows the filters to be lower in weight, while maintaining the required strength to withstand the impact and passage of molten steel. Te lower weight reduces the occurrence of pore blockage within the filter structure and facilitates the ability to sup- ply a product with finer porosity. In addition, the frame and robustness of the ceramic provide a filter that exhibits superior


金非ӣ部ם除Ծלਈ，֘滤过过流液ً金：滤过.1


集收љՕ，性特理物չ学化ङ构ৈ֘滤过йं。ૅ物ً 达Օ率效ङૅ杂除Ծ֘滤过明੮验ડך很。ট颗ङش较 左右。


ў铸֨，量ਈङ流液ً金дشӗ֘滤过：Ӳ控量流


。流紊ङ液ً金Ѻ降йӯ有И३过型ҭ ս废ङѺ较、性ਚ一ङ高较括包הױङ滤过ў钢铸


测检صӗ、چ洁Ұ面੮高提、本成չ间时整ғصӗ、率 工ҁ。 普量фў铸उ世ه 根据3UJKXT )GYZOTMङȔআ 预查લ֫١。吨Ѕ 查ȕ报ճ，Ҷ球铸钢ўङф量О 约םપ是就Э， йصў钢铸ङ֘滤过用҅球Ҷ，测 。理ה滤过经未ў铸ङ吨Ѕ Одઆ释铸钢过滤技术未ਈ得ӱ较高水平ङ应用，ѹ ١项一д੧进此就՛Ҹ造铸֝集ॠבक़ङ威ਲ维敦Ѱй ןў铸п有֨现（ت尺ў铸：括包֜ԽङИҿ。ूલ֫ 要性ਚ一ङў铸п一（型ঝў铸、）滤过੧进ਈЉ，ם 量םў铸҅本成力动劳ङѺ较（প֜理֪Ճљ）Ѻ较求 滤过д用采实ेЏѣф生ў钢铸ך很。）זғ工ы用҅ 包֜Խ。Иў铸ӣ部شङ限有й用应ҿرю是Ѹ，术技 协Љչ题问现ӟਈՕ֘滤过用҅Иф生造铸֨ӱਖ਼ৰ括 લ，尤ҿ是铸型ङҭ型过३。还要注意ङ是，铸ў生ф 。֘滤过ङ效高更求需ङे明Џѣ ՛Ҹॠבक़，求需高更性续持ث统系֘滤过足满дО


սф>+2+:9Оҁ，版进改ङ֘滤过瓷陶沫泡ׂ锆ӟՇू 框瓷陶是边յङ֘滤过'8:2; 系ӧङ੭ҭ。9:+2+> @8 ，چ强ङ求要۱д持ґ时գ，量重ङ֘滤过д轻ӗ，架 ֜дصӗ量重ङѺ较。过通չӠ冲ङ液钢Չ承לਈ它҅ ङش更וӀսф҅Օ并，塞堵隙孔ङ生Շ构ৈ֘滤过О ֘滤过҅љՕ性定६չ构ৈ架框ङ瓷陶，י此。چ隙孔 ֘滤过Њ生Շў铸Ѻ降љՕ，此֜，چ强ङ越卓ӟ现੮ 有Ҽङ缺陷ङՕਈ性。


72 | FOUNDRY-PLANET.COM | MODERN CASTING | CHINA FOUNDRY ASSOCIATION March 2016


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